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# frozen_string_literal: true
# Disable the UnusedMethodArgument linter, since we need to declare the kwargs
# in the methods, but we don't actually use them.
require "opentracing"
require "grpc"
module Labkit
module Tracing
module GRPC
# GRPCServerInterceptor is a server-side GRPC interceptor
# for instrumenting GRPC calls with distributed tracing
# in a GRPC Ruby server
class ServerInterceptor < ::GRPC::ServerInterceptor
include Labkit::Correlation::GRPC::GRPCCommon
def request_response(request: nil, call: nil, method: nil)
wrap_with_tracing(call, method, "unary") do
yield
end
end
def client_streamer(call: nil, method: nil)
wrap_with_tracing(call, method, "client_stream") do
yield
end
end
def server_streamer(request: nil, call: nil, method: nil)
wrap_with_tracing(call, method, "server_stream") do
yield
end
end
def bidi_streamer(requests: nil, call: nil, method: nil)
wrap_with_tracing(call, method, "bidi_stream") do
yield
end
end
private
def wrap_with_tracing(call, method, grpc_type)
context = TracingUtils.tracer.extract(OpenTracing::FORMAT_TEXT_MAP, call.metadata)
method_name = "/#{rpc_split(method).join("/")}"
tags = {
"component" => "grpc",
"span.kind" => "server",
"grpc.method" => method_name,
"grpc.type" => grpc_type,
}
TracingUtils.with_tracing(operation_name: "grpc:#{method_name}", child_of: context, tags: tags) do |_span|
yield
end
end
end
end
end
end
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